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with the below dataset, the variables are CONCentration, DOSE and TIME. I would like to display dosing information in the gap plots (see attachment).

Dosing records are the records with the variable of DOSE > 0 and variable of CONCentration = NA; concentration records are the records with the variable of CONCentration > 0 and variable of DOSE ='.'  

The only problem on the right panel of the attached gap plot is the first dosing information should be 2.4mg at 167.833hr (see in data), but looks like third dosing record which is 2mg at 23.8333hr in the data to show on the right panel of the gap plot with text() and arrow(). I really don't know how to deal with this with gap.plot. When using gap.plot() to separate the DoseTime, pch only pick single character. Looking forward to your instructions.

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